BIND 10 #570: question duplicated results in servfail

[BIND 10 Development]

#570: question duplicated results in servfail
--------------------------------+---------------------------------
           Reporter:  jreed     |                      Owner:
               Type:  defect    |                     Status:  new
           Priority:  major     |                  Milestone:
          Component:  resolver  |                   Keywords:
          Sensitive:  0         |  Estimated Number of Hours:  0
Add Hours to Ticket:  0         |                  Billable?:  1
        Total Hours:  0         |                  Internal?:  0
--------------------------------+---------------------------------
 First response is fine. But still has second query that has a servfail.
 See extra question added and multiple answers for same query:

 {{{

 [b10-resolver] Got a DNS message
 [b10-resolver] received a message:
 ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63665
 ;; flags: rd ; QUESTION: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

 ;; QUESTION SECTION:
 ;isc.org. IN A

 [b10-resolver] Processing normal query
 [b10-resolver] Sending upstream query (isc.org. IN A
 ) to 127.0.0.1
 [b10-resolver] Sending ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:
 0
 ;; flags: rd ; QUESTION: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

 ;; QUESTION SECTION:
 ;isc.org. IN A
  to 127.0.0.1
 [b10-resolver] Received response from 127.0.0.1
 [b10-resolver] [XX] got an answer
 [b10-resolver] Adding question isc.org. to message
 [b10-resolver] sending a response (272bytes):
 ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63665
 ;; flags: qr rd ra ; QUESTION: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 6

 ;; QUESTION SECTION:
 ;isc.org. IN A

 ;; ANSWER SECTION:
 isc.org. 883 IN A 149.20.64.42

 ;; AUTHORITY SECTION:
 isc.org. 28131 IN NS ord.sns-pb.isc.org.
 isc.org. 28131 IN NS ams.sns-pb.isc.org.
 isc.org. 28131 IN NS sfba.sns-pb.isc.org.
 isc.org. 28131 IN NS ns.isc.afilias-nst.info.

 ;; ADDITIONAL SECTION:
 ams.sns-pb.isc.org. 28131 IN A 199.6.1.30
 ams.sns-pb.isc.org. 28131 IN AAAA 2001:500:60::30
 ord.sns-pb.isc.org. 28131 IN A 199.6.0.30
 ord.sns-pb.isc.org. 28131 IN AAAA 2001:500:71::30
 sfba.sns-pb.isc.org. 28131 IN A 149.20.64.3
 sfba.sns-pb.isc.org. 28131 IN AAAA 2001:4f8:0:2::19

 [b10-resolver] [XX] got an answer
 [b10-resolver] [XX] got an answer
 [b10-resolver] Adding question isc.org. to message
 [b10-resolver] sending a response (31bytes):
 ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 63665
 ;; flags: qr rd ra ; QUESTION: 2, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

 ;; QUESTION SECTION:
 ;isc.org. IN A
 ;isc.org. IN A

 }}}

 {{{

 11:25:22.091100 IP 127.0.0.1.53645 > 127.0.0.1.53: 63665+ A? isc.org. (25)
         0x0000:  4500 0035 0000 0000 4011 0000 7f00 0001  E..5.... at .......
         0x0010:  7f00 0001 d18d 0035 0021 4791 f8b1 0100  .......5.!G.....
         0x0020:  0001 0000 0000 0000 0369 7363 036f 7267  .........isc.org
         0x0030:  0000 0100 01                             .....
 11:25:22.092289 IP 127.0.0.1.53 > 127.0.0.1.53645: 63665 1/4/6 A
 149.20.64.42 (272)
         0x0000:  4500 012c 8f30 0000 4011 0000 7f00 0001  E..,.0.. at .......
         0x0010:  7f00 0001 0035 d18d 0118 e507 f8b1 8180  .....5..........
         0x0020:  0001 0001 0004 0006 0369 7363 036f 7267  .........isc.org
         0x0030:  0000 0100 01c0 0c00 0100 0100 0003 7300  ..............s.
         0x0040:  0495 1440 2ac0 0c00 0200 0100 006d e300  ...@*........m..
         0x0050:  0d03 6f72 6406 736e 732d 7062            ..ord.sns-pb
 11:25:22.092601 IP 127.0.0.1.53 > 127.0.0.1.53645: 63665 ServFail [2q],
 0/0/0 (31)
         0x0000:  4500 003b 0000 0000 4011 0000 7f00 0001  E..;.... at .......
         0x0010:  7f00 0001 0035 d18d 0027 b841 f8b1 8182  .....5...'.A....
         0x0020:  0002 0000 0000 0000 0369 7363 036f 7267  .........isc.org
         0x0030:  0000 0100 01c0 0c00 0100 01              ...........
 }}}

 This problem didn't exist prior to Jan. 24. In this case the client (id
 63665 or port 53645) was dig. It never displayed the additional response.

-- 
Ticket URL: <http://bind10.isc.org/ticket/570>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development